Earliest 340 production date/number

Rob R said

The earliest for me was a 2-67 and it had a couple of things that I've never seen before..it had a serial number on the drivers front of the block 00007 and it had one machined pocket on both deck surfaces that told you the deck height when you dropped a dial gauge into it..

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Being that it was so early, and with a low number, it would have been part of a "pilot" build. There is one about 6 months before production launch. It is used to see how well the tooling is and how everything fits/works together. That could have been one of the first batch of blocks to come off of the production 340 block casting tools. May or may not have been machined in the engine plant, or in a prototype machine shop. It could have been in the first batch of blocks run to test the block line's capability to machine them and set up the process limits/targets.

That's cool that you have one of that vintage!